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Add support for the Game Boy MBC6 mapper (ROM read)

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This commit is contained in:
Lesserkuma 2022-09-28 15:15:04 +02:00
parent 282f5bc108
commit 38c2262f1c
1 changed files with 21 additions and 3 deletions
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24
Cart_Reader/GB.ino
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@ -421,7 +421,7 @@ void showCartInfo_GB() {
else if ((romType == 25) || (romType == 26) || (romType == 27) || (romType == 28) || (romType == 29) || (romType == 309)) else if ((romType == 25) || (romType == 26) || (romType == 27) || (romType == 28) || (romType == 29) || (romType == 309))
print_Msg(F("MBC5")); print_Msg(F("MBC5"));
else if (romType == 32) else if (romType == 32)
print_Msg(F("MBC6 (no support)")); print_Msg(F("MBC6"));
else if (romType == 34) else if (romType == 34)
print_Msg(F("MBC7")); print_Msg(F("MBC7"));
else if (romType == 252) else if (romType == 252)
@ -924,18 +924,28 @@ void readROM_GB() {
if (romType == 0x104) { if (romType == 0x104) {
startBank = 0; startBank = 0;
romBanks >>= 1; romBanks >>= 1;
endAddress = 0x7FFF;
}
// MBC6 banks are half size
else if (romType == 32) {
romBanks <<= 1;
endAddress = 0x3FFF;
} }
for (word currBank = startBank; currBank < romBanks; currBank++) { for (word currBank = startBank; currBank < romBanks; currBank++) {
// Second bank starts at 0x4000 // Second bank starts at 0x4000
if (currBank > 1) { if (currBank > 1) {
romAddress = 0x4000; romAddress = 0x4000;
// MBC6 banks are half size
if (romType == 32) {
endAddress = 0x5FFF;
}
} }
// M161 banks are double size and need mapper reset // Set ROM bank for M161
if (romType == 0x104) { if (romType == 0x104) {
romAddress = 0; romAddress = 0;
endAddress = 0x7FFF;
PORTH &= ~(1 << 0); PORTH &= ~(1 << 0);
delay(50); delay(50);
PORTH |= (1 << 0); PORTH |= (1 << 0);
@ -953,6 +963,14 @@ void readROM_GB() {
} }
} }
// Set ROM bank for MBC6
else if (romType == 32) {
writeByte_GB(0x2800, 0);
writeByte_GB(0x3800, 0);
writeByte_GB(0x2000, currBank);
writeByte_GB(0x3000, currBank);
}
// Set ROM bank for TAMA5 // Set ROM bank for TAMA5
else if (romType == 0xFD) { else if (romType == 0xFD) {
writeByteSRAM_GB(0xA001, 0); writeByteSRAM_GB(0xA001, 0);